<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <form action="#" method="GET">
        <input class="fir" type="text" name="user-name" value="用户名">
        <input class="sec" type="submit">
    </form>
    <script type="text/javascript" src="focus.js"></script>
</body>
</html>